Lattice Boltzmann Methods for Fluid Structure Interaction
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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The use of lattice Boltzmann methods LBM for fluid flow and its coupling with finite element method FEM structural models for fluid-structure interaction FSI is investigated. A body of high performance LBM software that exploits graphic processing unit GPU and multiprocessor programming models is developed and validated against a set of two- and three-dimensional benchmark problems. Computational performance is shown to exceed recently reported results for single-workstation implementations over a range of problem sizes. A mixed-precision LBM collision algorithm is presented that retains the accuracy of double-precision calculations with less computational cost than a full double-precision implementation. FSI modelling methodology and example applications are presented along with a novel heterogeneous parallel implementation that exploits task-level parallelism and workload sharing between the central processing unit CPU and GPU that allows significant speedup over other methods. Multicomponent LBM fluid models are explicated and simple immiscible multi-component fluid flows in two-dimensions are presented. These multi-component fluid LBM models are also paired with structural dynamics solvers for two-dimensional FSI simulations. To enhance modeling capability for domains with complex surfaces, a novel coupling method is introduced that allows use of both classical LBM CLBM and a finite element LBM FELBM to be combined into a hybrid LBM that exploits the flexibility of FELBM while retaining the efficiency of CLBM.
- Computer Programming and Software
- Fluid Mechanics